<div class="unit one-fifth hide-on-mobiles">
  <aside>
    {% for section in site.data.docs_nav %}
      <h4>{{ section.title }}</h4>
      <ul>
        {% for item in section.docs %}
          {% assign p = site.documents | where: "url", item.link | first %}
          <li {%- if page.url == p.url %} class="current" {%- endif %}>
            <a href="{{ p.url }}">
              {{ p.menu_name | default: p.title }}
            </a>
          </li>
        {% endfor %}
      </ul>
    {% endfor %}
  </aside>
</div>
